Horsenden Hill (grid reference TQ 161 843) is a hill and open space, located in the Perivale, Sudbury, and Greenford areas of London, UK. It is in the London Borough of Ealing, close to the boundary with the London Borough of Brent. It is one of the higher eminences in the local area, rising to 85m / 276 ft above sea level, and the summit forms part of the site of an ancient hillfort.